21731064352 has 48 divisors (see below), whose sum is σ = 43197862680. Its totient is φ = 10760343552.

The previous prime is 21731064301. The next prime is 21731064371. The reversal of 21731064352 is 25346013712.

It can be written as a sum of positive squares in 4 ways, for example, as 10511170576 + 11219893776 = 102524^2 + 105924^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6988174 + ... + 6991282.

Almost surely, 2^21731064352 is an apocalyptic number.

It is an amenable number.

21731064352 is a deficient number, since it is larger than the sum of its proper divisors (21466798328).

21731064352 is a wasteful number, since it uses less digits than its factorization.

21731064352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5165 (or 5157 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 34.

The spelling of 21731064352 in words is "twenty-one billion, seven hundred thirty-one million, sixty-four thousand, three hundred fifty-two".